Defrosting system for condensing heat recovery of refrigerator and control method thereof, refrigerator

Abstract

This application relates to the field of home appliance technology, providing a defrosting system and control method for refrigerator condensation heat recovery, and a refrigerator. The defrosting system includes a defrosting medium and a loop assembly. The defrosting medium includes at least one of water and a hygroscopic solution, and circulates within the loop assembly. The loop assembly includes a heat-absorbing element, a heat-releasing element, a transfer container, and a collection container. The heat-absorbing element has a heat-absorbing channel filled with the defrosting medium, and a first input end and a first output end connected to the heat-absorbing channel. The heat-releasing element has a heat-releasing channel, and a second input end and a second output end connected to the heat-releasing channel. The transfer container is filled with the defrosting medium and connected to the first output end and the second input end. The collection container is connected to the second output end and the first input end. This application performs defrosting by recovering the condensation waste heat generated by the condenser itself, eliminating the need for additional electrical energy consumption for defrosting, achieving low-energy passive defrosting, and helping to reduce operating costs.

Description

Technical Field

[0001] This application belongs to the field of home appliance technology, and more specifically, relates to a defrosting system for refrigerator condensation heat recovery and its control method, and a refrigerator. Background Technology

[0002] In related technologies, a refrigerator includes a compressor, a condenser, and an evaporator. The compressor is used to compress and increase the pressure of the gaseous refrigerant, the condenser is used to dissipate heat and condense the compressed high-temperature and high-pressure refrigerant, and the evaporator is used to evaporate and absorb heat after throttling, so as to achieve the cooling of the refrigerator compartments.

[0003] However, most refrigerators currently use high-power electric heating elements for active defrosting, which consumes a lot of energy and has high operating costs. Summary of the Invention

[0004] The purpose of this application is to provide a defrosting system and its control method for refrigerator condensation heat recovery, and a refrigerator, aiming to solve the technical problem of high energy consumption caused by traditional electric heating defrosting in related technologies.

[0005] To achieve the above objectives, according to one aspect of this application, a defrosting system for refrigerator condensation heat recovery is provided, comprising a defrosting medium and a circuit assembly. The defrosting medium includes at least one of water and a hygroscopic solution, and circulates within the circuit assembly. The circuit assembly includes a heat-absorbing element, a heat-releasing element, a transfer container, and a collection container. The heat-absorbing element has a heat-absorbing channel filled with the defrosting medium, and a first input end and a first output end communicating with the heat-absorbing channel. The heat-releasing element has a heat-releasing channel, and a second input end and a second output end communicating with the heat-releasing channel. The transfer container is filled with the defrosting medium and connected to the first... The refrigerator has an output terminal and a second input terminal; a collection container connects the second output terminal and the first input terminal; a heat-absorbing element absorbs heat from the refrigerator's condenser to vaporize the defrosting medium in the heat-absorbing channel; a transfer container receives and condenses the defrosting medium; a heat-releasing element releases heat to defrost the refrigerator's evaporator and can lower the gas pressure in the heat-releasing channel below the saturated vapor pressure of the defrosting medium in the transfer container, thereby causing the defrosting medium in the transfer container to spontaneously vaporize and condense in the heat-releasing element; and a collection container receives the liquid defrosting medium flowing out from the second output terminal and can supply the liquid defrosting medium to the first input terminal.

[0006] Optionally, the connecting pipe between the first output terminal and the transfer container is provided with a first on / off control element, the connecting pipe between the transfer container and the second input terminal is provided with a second on / off control element, the connecting pipe between the second output terminal and the collection container remains open, and the connecting pipe between the collection container and the first input terminal is provided with a third on / off control element.

[0007] Optionally, the collection container is connected to the first output terminal.

[0008] Optionally, a fourth on / off control element is provided in the connecting pipe between the collection container and the first output end, and the fourth on / off control element and the first on / off control element are respectively located in different connecting pipes.

[0009] Optionally, the collection container is positioned above the heat-absorbing element; and / or, the heat-releasing element is positioned above the collection container; and / or, a heat-dissipating element is provided on the outside of the transfer container for dissipating heat from the transfer container; and / or, the inner wall of the heat-releasing channel is coated with a hydrophobic layer.

[0010] According to another aspect of this application, a control method for a defrosting system for refrigerator condensation heat recovery is provided, applied to the aforementioned defrosting system for refrigerator condensation heat recovery. The control method includes: during normal operation of the condenser, setting a first on / off control element to a conducting state, and setting both a second and third on / off control element to a cut-off state, so that the defrosting medium in the heat absorption channel is heated and vaporized, and condensed and liquefied in the transfer container; after the condenser stops operating, setting both the first and third on / off control elements to a cut-off state, and setting the second on / off control element to a conducting state, so that the defrosting medium in the transfer container spontaneously vaporizes and condenses and liquefied in the heat release element; after defrosting is completed, setting both the first and second on / off control elements to a cut-off state, and setting the third on / off control element to a conducting state, so that the defrosting medium in the collection container flows back to the heat release element.

[0011] Optionally, the defrosting medium is a hygroscopic solution, the collection container is connected to the first output end, and a fourth on / off control element is provided in the connecting pipe between the collection container and the first output end. The fourth on / off control element and the first on / off control element are located in different connecting pipes. During normal operation of the condenser, the fourth on / off control element is in the cut-off state. After the condenser stops operating, the fourth on / off control element is in the conducting state.

[0012] Optionally, the defrosting medium is a hygroscopic solution; during normal operation of the condenser, when the concentration of the defrosting medium in the heat absorption element reaches a preset upper limit, the first on / off control element, the second on / off control element, and the third on / off control element are all in a cut-off state.

[0013] According to another aspect of this application, a refrigerator is provided, including a compressor, a condenser, an evaporator, and the aforementioned defrosting system for refrigerator condensation heat recovery. The output end of the compressor is connected to the input end of the condenser, the output end of the condenser is connected to the input end of the evaporator, and the output end of the evaporator is connected to the input end of the compressor. The heat-absorbing element is in contact with the outer surface of the condenser, and the heat-releasing element is in contact with the outer surface of the evaporator.

[0014] Optionally, the heat-absorbing element is coiled around the outer periphery of the condenser and is in contact with the condenser; and / or, the heat-releasing element is coiled around the outer periphery of the evaporator and is in contact with the evaporator.

[0015] The defrosting system provided in this application has the following advantages: The defrosting system relies on the latent heat released by the gas-liquid phase change to induce the melting of the frost layer on the evaporator, which has multiple advantages compared to traditional electric heating defrosting. Firstly, during the operation of the defrosting system, the heat-absorbing element absorbs the waste heat generated during the condenser's operation, causing the defrosting medium in the heat-absorbing channel to undergo a liquid-gas phase change. During this phase change, the waste heat from the condenser is absorbed and stored as latent heat. Subsequently, the defrosting medium in the transfer container spontaneously vaporizes and then undergoes a gas-liquid phase change and condensation in the heat-releasing element, simultaneously releasing the latent heat of phase change to the evaporator to achieve defrosting. This application achieves defrosting by recovering the waste heat generated by the condenser itself. Compared to active defrosting using high-power electric heating tubes, it eliminates the need for additional electrical energy consumption, achieving low-energy passive defrosting and helping to reduce operating costs.

[0016] Secondly, the gas-liquid phase change process has the physical characteristics of gentle heat release and relatively constant operating temperature. The defrosting medium always completes the vaporization and liquefaction cycle at a relatively mild phase change temperature in the loop components, without generating local extreme high temperatures. Compared with the defrosting method using high-power electric heating tubes, the mild phase change defrosting mechanism adopted in this application can effectively avoid the thermal shock to the evaporator caused by the high-temperature heat radiation and heat convection of traditional electric heating defrosting, weaken the heat penetration effect brought about by the defrosting cycle, suppress the drastic temperature fluctuation of the evaporator, achieve mild defrosting, and ensure the stability of the preservation environment of the compartment corresponding to the evaporator.

[0017] Third, after the defrosting medium vaporizes, it flows in the heat release channel of the heat release element in the form of vapor. Relying on the thermodynamic temperature difference tendency of vapor flow, the vapor can automatically gather in the area with lower temperature and thicker frost layer on the outside of the heat release channel wall, and release more latent heat of phase change for defrosting. This vapor-liquid phase change with its inherent targeted tracking and adaptive adjustment capability allows the defrosting heat to automatically match the frost thickness in different areas of the evaporator, fundamentally overcoming the technical limitations of traditional high-power electric heating tubes that have a fixed defrosting heat distribution and cannot adapt to non-uniform frost on the evaporator surface, thus improving the thoroughness and consistency of defrosting. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a refrigerator provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the loop assembly provided in the embodiments of this application; Figure 3 The schematic diagram of the refrigerator provided in the embodiments of this application is used to show the on / off state of each component of the refrigerator when the defrosting medium in the heat-absorbing component is heated and vaporized and condensed and liquefied in the transfer container. Figure 4 The schematic diagram of the refrigerator provided in the embodiments of this application is used to show the on / off state of each component of the refrigerator when the defrosting medium in the transfer container spontaneously vaporizes and condenses into liquefaction in the heat release element; Figure 5 The schematic diagram of the refrigerator provided in the embodiments of this application is used to show the on / off state of each component of the refrigerator when the defrosting medium in the collection container flows back to the heat absorption component; The details of the reference numerals used in the above figures are as follows: 100. Loop assembly; 110. Heat absorber; 111. First input terminal; 112. First output terminal; 120. Heat release component; 121. Second input terminal; 122. Second output terminal; 130. Transfer container; 140. Collection container; 151. First on / off control component; 152. Second on / off control component; 153. Third on / off control component; 154. Fourth on / off control component; 160. Heat dissipation component; 161. Heat dissipation fins; 162. Heat dissipation fan; 200, Compressor; 300, Condenser; 400, Evaporator; 500, Expansion valve. Detailed Implementation

[0020] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0021] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly or indirectly on that other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to that other element. Unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0024] As described in the background section, in related technologies, refrigerators include a compressor, a condenser, and an evaporator. The compressor is used to compress and pressurize the gaseous refrigerant, the condenser is used to dissipate heat and condense the compressed, high-temperature, and high-pressure refrigerant, and the evaporator is used to evaporate and absorb heat from the throttled refrigerant to achieve cooling of the refrigerator compartments. However, current refrigerators generally use high-power electric heating elements for active defrosting, which is energy-intensive and has high operating costs.

[0025] Reference Figures 1 to 5 To address the aforementioned problems, according to one aspect of this application, an embodiment of this application provides a defrosting system for refrigerator condensation heat recovery (hereinafter referred to as the defrosting system). The defrosting system includes a defrosting medium and a circuit assembly 100. The defrosting medium includes at least one of water and a hygroscopic solution, and the defrosting medium circulates within the circuit assembly 100.

[0026] The loop assembly 100 includes a heat-absorbing element 110, a heat-releasing element 120, a transfer container 130, and a collection container 140. The heat-absorbing element 110 has a heat-absorbing channel filled with a defrosting medium, and a first input terminal 111 and a first output terminal 112 connected to the heat-absorbing channel. The heat-releasing element 120 has a heat-releasing channel, and a second input terminal 121 and a second output terminal 122 connected to the heat-releasing channel. The transfer container 130 is filled with a defrosting medium and is connected to the first output terminal 112 and the second input terminal 121. The collection container 140 is connected to the second output terminal 122 and the first input terminal 111.

[0027] The heat-absorbing element 110 is used to absorb heat from the condenser 300 of the refrigerator, so that the defrosting medium in the heat-absorbing channel is heated and vaporized; the transfer container 130 is used to receive and condense the defrosting medium; the heat-releasing element 120 is used to release heat to defrost the evaporator 400 of the refrigerator, and can make the gas pressure in the heat-releasing channel lower than the saturated vapor pressure of the defrosting medium in the transfer container 130, so as to drive the defrosting medium in the transfer container 130 to spontaneously vaporize and condense in the heat-releasing element 120; the collection container 140 is used to receive the liquid defrosting medium flowing out from the second output terminal 122, and can deliver the liquid defrosting medium to the first input terminal 111.

[0028] In this embodiment of the application, the defrosting system is applied to a refrigerator, which includes a compressor 200, a condenser 300 and an evaporator 400. The output end of the compressor 200 is connected to the input end of the condenser 300, the output end of the condenser 300 is connected to the input end of the evaporator 400, and the output end of the evaporator 400 is connected to the input end of the compressor 200.

[0029] The start / stop status of compressor 200 determines the operating conditions of condenser 300 and evaporator 400. Specifically, when compressor 200 is running normally, it drives the refrigerant circulation, condenser 300 continuously releases heat, and evaporator 400 continuously absorbs heat to cool down. Water vapor in the air gradually condenses and frosts on the surface of evaporator 400. After compressor 200 stops running, refrigerant circulation ends, condenser 300 stops releasing heat, evaporator 400 also stops cooling, and the whole unit then enters the defrosting state.

[0030] The loop assembly 100 is a closed loop structure; specifically, after the various components of the defrosting system are connected by pipes, a vacuum process is performed, and defrosting medium is injected into the heat absorption element 110 and the transfer container 130 respectively.

[0031] The heat-absorbing component 110 is a heat-absorbing pipe, heat-absorbing plate, or heat-absorbing jacket. The hollow space inside the heat-absorbing component 110 forms a heat-absorbing flow channel. The heat-absorbing component 110 absorbs the waste heat released by the condenser 300 through close contact with the condenser 300. The heat-releasing component 120 is a heat-releasing pipe, heat-releasing plate, or heat-releasing jacket. The hollow space inside the heat-releasing component 120 forms a heat-releasing flow channel. The heat-releasing component 120 defrosts the evaporator 400 through close contact with the evaporator 400. The transfer container 130 is placed in the atmospheric environment. Additionally, the instruction manual includes... Figures 3 to 5 The arrows in the diagram represent the flow direction of the defrosting medium in the corresponding connecting pipe, and the dashed lines represent the corresponding connecting pipe being cut off.

[0032] In one specific embodiment, the defrosting medium is a hygroscopic solution, which may be any one of lithium bromide solution, calcium chloride solution, ionic liquid or deep eutectic solvent.

[0033] Since the waste heat temperature of condenser 300 can reach 45℃~55℃, significantly higher than the ambient temperature (approximately 25℃), after the heat absorber 110 absorbs heat from condenser 300, the defrosting medium in the heat absorption channel is heated and vaporized. During this process, only the moisture in the defrosting medium vaporizes into water vapor, while the hygroscopic solutes in the defrosting medium do not volatilize and remain in the heat absorption channel, promoting the desorption process of the defrosting medium. Driven by the temperature difference, the water vapor is introduced into the transfer container 130, where it is condensed and liquefied. This process not only achieves effective recovery of waste heat from condenser 300 but also moderately reduces the operating temperature of condenser 300, improving the overall operational stability of condenser 300.

[0034] Since the temperature of the evaporator 400 is in the sub-zero range, significantly lower than the ambient temperature, when the heat release element 120 defrosts the evaporator 400, the gas pressure in the heat release channel of the heat release element decreases due to the low temperature, falling below the saturated vapor pressure of the defrosting medium in the transfer container 130, thus creating a pressure difference. Under the action of this pressure difference, the defrosting medium in the transfer container 130 spontaneously vaporizes, causing desorption. Simultaneously, water vapor is driven by the pressure difference into the heat release channel and condenses and liquefies within it. During this conversion process, the latent heat released by the gas-liquid phase change inside the heat release channel is transferred to the evaporator 400, thereby achieving targeted exothermic defrosting.

[0035] By using a hygroscopic solution as the defrosting medium, the unique characteristics of the hygroscopic solution—low saturated vapor pressure, strong hygroscopic and desorption properties, stable phase change at low temperatures, and low solute volatility—can be utilized. On the one hand, the defrosting medium maintains self-circulation under both normal and low-temperature conditions, effectively reducing the risk of low-temperature freezing failure and broadening the environmental applicability of the defrosting system. On the other hand, relying on the cyclical characteristics of hygroscopic and desorption of the defrosting medium, the efficiency of condensation heat recovery and the uniformity of defrosting the evaporator at 400°C are improved.

[0036] In another specific embodiment, the defrosting medium is an aqueous solution. After the heat-absorbing element 110 absorbs heat from the condenser 300, the defrosting medium in the heat-absorbing channel is heated and vaporized. The water vapor generated by the phase change of the defrosting medium is driven by the temperature difference into the transfer container 130, where it is condensed and liquefied. This achieves the recovery and utilization of waste heat from the condenser 300 and reduces the operating temperature of the condenser 300.

[0037] When the heat release element 120 defrosts the evaporator 400, the gas pressure in the heat release channel of the heat release element decreases due to the low temperature and is lower than the saturated vapor pressure of the defrosting medium in the transfer container 130, thus forming a pressure difference. Under the action of this pressure difference, the defrosting medium in the transfer container 130 will spontaneously vaporize into water vapor, and the water vapor will enter the heat release channel and condense and liquefy in the heat release channel. During this phase change process, the latent heat released by the gas-liquid phase change inside the heat release channel is transferred to the evaporator 400, thereby achieving targeted heat release defrosting.

[0038] Using water as the defrosting medium helps reduce operating costs. Furthermore, water is non-corrosive and non-toxic, making it safe and reliable. It eliminates the need for special anti-corrosion structures, simplifying the structural design of the defrosting system and reducing costs.

[0039] The defrosting system of this application relies on the latent heat released by the gas-liquid phase change to induce the melting of the frost layer on the evaporator 400, which has multiple advantages over traditional electric heating defrosting: Firstly, during the operation of the defrosting system, the heat-absorbing element 110 absorbs the waste heat generated during the operation of the condenser 300, causing the defrosting medium in the heat-absorbing channel to undergo a liquid-gas phase change. During the phase change, the waste heat from the condenser 300 is absorbed and stored as latent heat. Subsequently, the defrosting medium in the transfer container 130 spontaneously vaporizes and then completes the gas-liquid phase change and condensation in the heat-releasing element 120, simultaneously releasing the latent heat of phase change to the evaporator 400 to achieve defrosting. This application achieves defrosting by recovering the waste heat generated by the condenser 300 itself. Compared with the active defrosting method using high-power electric heating tubes, it does not require additional electrical energy consumption for defrosting, achieving low-energy passive defrosting and helping to reduce operating costs.

[0040] Secondly, the gas-liquid phase change process has the physical characteristics of gentle heat release and relatively constant operating temperature. The defrosting medium always completes the vaporization and liquefaction cycle at a relatively mild phase change temperature in the loop component 100, without generating local extreme high temperatures. Compared with the defrosting method using high-power electric heating tubes, the mild phase change defrosting mechanism adopted in this application can effectively avoid the thermal shock to the evaporator 400 caused by the high-temperature heat radiation and heat convection of traditional electric heating defrosting, weaken the heat penetration effect caused by the defrosting cycle, suppress the drastic temperature fluctuation of the evaporator 400, achieve mild defrosting, and ensure the stability of the freshness preservation environment of the compartment corresponding to the evaporator 400.

[0041] Third, after the defrosting medium vaporizes, it flows in the heat release channel of the heat release element 120 in the form of steam. Relying on the thermodynamic temperature difference tendency of the steam flow, the steam can automatically gather in the area with lower temperature and thicker frost layer on the outside of the heat release channel wall, and release more latent heat of phase change for defrosting. This inherent targeted tracking and adaptive adjustment capability of the steam-liquid phase change allows the defrosting heat to automatically match the frost thickness in different areas of the evaporator 400, fundamentally overcoming the technical limitations of traditional high-power electric heating tubes that have a fixed defrosting heat distribution and cannot adapt to the non-uniform frost on the surface of the evaporator 400, thus improving the thoroughness and consistency of defrosting.

[0042] Reference Figures 1 to 5 In one embodiment, a first on / off control element 151 is provided in the connecting pipe between the first output terminal 112 and the transfer container 130, a second on / off control element 152 is provided in the connecting pipe between the transfer container 130 and the second input terminal 121, the connecting pipe between the second output terminal 122 and the collection container 140 is kept connected, and a third on / off control element 153 is provided in the connecting pipe between the collection container 140 and the first input terminal 111. The first on / off control element 151, the second on / off control element 152 and the third on / off control element 153 are respectively used to control the on / off state of the corresponding connecting pipes.

[0043] In this embodiment, the first on / off control element 151, the second on / off control element 152, and the third on / off control element 153 are all on / off valves. The defrosting system also includes a control element, which is electrically connected to the first on / off control element 151, the second on / off control element 152, and the third on / off control element 153, and is used to uniformly control the working state of each on / off control element. It should be noted that in other embodiments, the first on / off control element 151, the second on / off control element 152, and the third on / off control element 153 may also be any one of a solenoid valve, a manual shut-off valve, a pipeline opening / closing element, or a fluid switch element. In addition, the connecting pipe between the second output terminal 122 and the collection container 140 remains normally open.

[0044] This application, by setting a first on / off control component 151, a second on / off control component 152, and a third on / off control component 153 on each section of the connecting pipe, can flexibly switch the on / off state of each section of the connecting pipe according to the different operating conditions of the condenser 300 and the evaporator 400, effectively reducing the risk of mutual interference between the refrigeration and defrosting conditions, and ensuring the controllability, flexibility, and stability of the overall operation of the defrosting system.

[0045] Specifically, during normal operation of the condenser 300, by keeping the first on / off control element 151 in the conducting state and keeping the second on / off control element 152 and the third on / off control element 153 in the cut-off state, the connecting pipe between the first output terminal 112 and the transfer container 130 is kept in the conducting state, while the connecting pipe between the transfer container 130 and the second input terminal 121, as well as the connecting pipe between the collection container 140 and the first input terminal 111, are all cut off. Under this condition, the defrosting medium in the heat absorption channel is heated and vaporized to produce water vapor. The water vapor can only enter the transfer container 130, condense and liquefy, and be temporarily stored in the transfer container 130. It will not flow to the heat release channel of the heat release element 120, thereby achieving effective recovery and storage of waste heat from the condenser 300.

[0046] After the condenser 300 stops operating, by setting both the first on / off control element 151 and the third on / off control element 153 to the off state and setting the second on / off control element 152 to the on state, the connecting pipe between the first output terminal 112 and the transfer container 130, as well as the connecting pipe between the collection container 140 and the first input terminal 111, are both cut off, while the connecting pipe between the transfer container 130 and the second input terminal 121 is made open. Under this condition, because the heat release channel of the heat release element 120 is in a low-temperature environment, a saturated vapor pressure difference is formed between the heat release channel and the transfer container 130, causing the defrosting medium in the transfer container 130 to spontaneously vaporize and generate water vapor. The water vapor is driven by the pressure difference to enter the heat release channel and undergoes a gas-liquid phase change and condensation in the heat release channel. The phase change process releases latent heat and transfers it to the evaporator 400, thereby achieving targeted heat release and uniform defrosting.

[0047] After defrosting, by setting both the first on / off control element 151 and the second on / off control element 152 to the off state and setting the third on / off control element 153 to the on state, the connecting pipes between the first output terminal 112 and the transfer container 130, as well as the connecting pipes between the transfer container 130 and the second input terminal 121, are all cut off, while the connecting pipe between the collection container 140 and the first input terminal 111 is made open. Under this condition, the liquid defrosting medium collected in the collection container 140 can smoothly flow back into the heat absorption channel of the heat absorption element 110, completing the medium circuit reset and preparing the medium for the next condenser 300 waste heat recovery and defrosting cycle.

[0048] By adopting the above-mentioned time-sharing on / off control method, the three working stages of heat recovery, targeted defrosting, and medium recirculation reset can be carried out independently and in an orderly manner. On the one hand, the operating sequence of refrigeration and defrosting conditions can be staggered to reduce energy loss caused by ineffective heat exchange; on the other hand, the defrosting medium can be recycled and reused to ensure the long-term stable operation of the gas-liquid phase change circuit and improve the reliability and energy-saving effect of the defrosting system.

[0049] Reference Figures 1 to 5 In one embodiment, the collection container 140 is connected to the first output terminal 112. In this embodiment, a portion of the connecting pipe between the collection container 140 and the first output terminal 112 is the same pipe segment as a portion of the connecting pipe between the first output terminal 112 and the transfer container 130. This pipe segment forms a common pipe segment to achieve shared flow and simplify pipe layout.

[0050] When the defrosting medium is a hygroscopic solution, after the heat absorber 110 absorbs heat from the condenser 300, the concentration of the defrosting medium in the heat absorption channel increases due to the evaporation of water. The high-concentration hygroscopic solution has strong hygroscopic properties and can significantly reduce the internal air pressure of the heat absorption channel.

[0051] When the heat-releasing element 120 defrosts the evaporator 400, the low-pressure environment helps to further promote the desorption and vaporization of the defrosting medium in the transfer container 130. During this process, the defrosting medium in the transfer container 130 spontaneously vaporizes to generate water vapor. Most of the water vapor condenses and liquefies in the heat-releasing channel and releases latent heat to achieve defrosting. A small portion of the water vapor enters the heat-absorbing channel through the connecting channel between the collection container 140 and the first output end 112.

[0052] Since the high-concentration defrosting medium in the heat absorption channel absorbs only a small amount of water vapor, the solution concentration decreases slowly, which helps to maintain the low-pressure state of the loop component 100 for a long time, thereby ensuring that the defrosting medium in the transfer container 130 can continuously and stably undergo desorption and vaporization, thus ensuring the continuous operation of the defrosting process.

[0053] Reference Figures 1 to 5 In one embodiment, a fourth on / off control element 154 is provided in the connecting pipe between the collection container 140 and the first output terminal 112. The fourth on / off control element 154 is used to control the on / off state of the connecting pipe. The fourth on / off control element 154 and the first on / off control element 151 are respectively located in different connecting pipes.

[0054] In this embodiment, the fourth on / off control element 154 is an on / off valve, and the control element maintains an electrical connection with all on / off control elements in the circuit assembly 100. It should be noted that in other embodiments, the fourth on / off control element 154 may also be any one of a solenoid valve, a manual shut-off valve, a pipeline opening / closing element, or a fluid switch. Furthermore, neither the first on / off control element 151 nor the fourth on / off control element 154 is located in the common pipe section, but rather in two separate pipe sections connected to the common pipe section.

[0055] This application provides a fourth on / off control element 154 on the connecting pipe between the collection container 140 and the first output terminal 112. The on / off state of the connecting pipe can be flexibly switched according to the different operating conditions of the condenser 300 and the evaporator 400, effectively reducing the risk of mutual interference between the refrigeration and defrosting conditions, and ensuring the controllability, flexibility and stability of the overall operation of the defrosting system.

[0056] Specifically, during normal operation of the condenser 300, by setting the fourth on / off control element 154 to the off state, the communication channel between the collection container 140 and the first output end 112 is cut off, preventing the defrosting medium in the heat absorption channel from being heated and vaporized to generate water vapor that accidentally enters the collection container 140 and condenses, thereby ensuring that the defrosting medium in the transfer container 130 has sufficient storage capacity and ensuring that subsequent defrosting operations are stable.

[0057] During the period when the condenser 300 is not running, by putting the fourth on / off control element 154 into the conducting state, the communication channel between the collection container 140 and the first output terminal 112 is put into the conducting state, so that the internal environment of the loop assembly 100 is continuously maintained at a low pressure, ensuring that the defrosting medium in the transfer container 130 can stably and spontaneously vaporize, and continuously provide the latent heat of phase change to the evaporator 400 to achieve targeted defrosting.

[0058] After defrosting, by setting the fourth on / off control element 154 to the cut-off state, the communication channel between the collection container 140 and the first output terminal 112 is cut off, so as to ensure that the liquid defrosting medium collected in the collection container 140 can all flow back to the heat absorption channel of the heat absorption element 110 through the communication pipe between the collection container 140 and the first input terminal 111, thereby completing the medium circuit reset and preparing the medium reserve for the next condenser 300 waste heat recovery and defrosting cycle.

[0059] By employing different control methods at different times, the pipeline on / off requirements of the three stages—heat recovery, targeted defrosting, and media recirculation reset—can be matched, achieving precise isolation and orderly switching of operating conditions. On the one hand, it avoids ineffective media flow and heat crosstalk, maintaining a low-pressure steady-state environment in the loop; on the other hand, it enables closed-loop recycling of the defrosting media, improving the automation level and long-term reliability of the defrosting system.

[0060] Reference Figures 1 to 5 In one embodiment, the collection container 140 is disposed above the heat absorber 110. In this embodiment, the collection container 140 is entirely located above the heat absorber 110, and a connecting pipe between the collection container 140 and the first input terminal 111 is disposed between the collection container 140 and the heat absorber 110. Access ports on the connecting pipe between the second output terminal 122 and the collection container 140, and on the connecting pipe between the collection container 140 and the first output terminal 112, are both disposed on the upper surface of the collection container 140. It should be noted that in other embodiments, the collection container 140 may only partially be disposed above the heat absorber 110.

[0061] On the one hand, the collection container 140 is positioned above the heat absorber 110, allowing the liquid defrosting medium in the collection container 140 to flow back into the heat absorber channel of the heat absorber 110 by gravity. This eliminates the need for additional power components such as pumps, which helps simplify the structure of the defrosting system and reduce overall cost and energy consumption.

[0062] On the other hand, the collection container 140 is arranged at a high position, which is conducive to the upward accumulation of gaseous medium and the downward sedimentation of liquid medium inside the loop assembly 100. This helps to achieve natural stratification of the gas and liquid phases, reduce the flow disturbance caused by gas-liquid mixing, and thus help to maintain the stability of gas pressure and saturated vapor pressure inside the loop assembly 100, ensuring the continuous effectiveness of the pressure difference driving effect between the transfer container 130 and the heat absorber 110.

[0063] Reference Figures 1 to 5 In one embodiment, the heat-releasing element 120 is disposed above the collection container 140, and the transfer container 130 is disposed above the heat-releasing element 120.

[0064] In this embodiment, the heat-releasing element 120 is located entirely above the heat-absorbing element 110, and the transfer container 130 is located entirely above the heat-releasing element 120; the access port on the connecting pipe between the first output end 112 and the transfer container 130, and the access port on the connecting pipe between the transfer container 130 and the second input end 121, are both located on the upper surface of the transfer container 130.

[0065] It should be noted that in other embodiments, the heat-releasing element 120 may be partially disposed above the collection container 140, the transfer container 130 may be partially disposed above the heat-releasing element 120, and the transfer container 130 may be level with the heat-releasing element 120 or disposed below the heat-releasing element 120.

[0066] In this application, the heat-releasing element 120 is arranged above the heat-absorbing element 110 and the transfer container 130 is arranged above the heat-releasing element 120, so that the entire loop assembly 100 is arranged from top to bottom as transfer container 130-heat-releasing element 120-collection container 140-heat-absorbing element 110.

[0067] On the one hand, this vertical hierarchical layout allows the liquid defrosting medium to flow downwards step by step by relying on the gravitational potential energy, with low flow resistance. There is no need to add external power devices such as pumps. The liquid defrosting medium can be circulated by gravity by relying on the height difference, which helps to simplify the system structure and reduce energy consumption.

[0068] On the other hand, this arrangement conforms to the natural separation law of gas and liquid, strengthens the phase change transport logic of gaseous medium converging upward and liquid medium settling downward, reduces the mixing disturbance of gas and liquid two phases, stabilizes the gas-liquid phase change cycle working condition inside the loop component 100, and ensures the continuous and stable operation of the defrosting medium phase change heat transfer process.

[0069] Reference Figures 1 to 5 In one embodiment, a heat sink 160 is provided on the outside of the transfer container 130, which is used to dissipate heat from the transfer container 130.

[0070] In this embodiment, the heat sink 160 includes heat sink fins 161 and a heat dissipation fan 162. The heat sink fins 161 are disposed on the outer peripheral surface of the transfer container 130 and are in contact with the outer surface of the transfer container 130. The heat dissipation fan 162 is disposed on one side of the transfer container 130 and is used to blow airflow onto the transfer container 130 to achieve convective heat dissipation. It should be noted that in other embodiments, the heat sink 160 may also include at least one of a heat exchange coil, an air-cooled radiator, and a natural heat dissipation fin.

[0071] While the heat-absorbing component 110 absorbs heat from the condenser 300, the heat-dissipating component 160 continuously provides forced heat dissipation to the transfer container 130, effectively reducing the overall temperature of the transfer container 130. The low-temperature environment allows the defrosting medium in the transfer container 130 to maintain a strong moisture absorption capacity, which can fully absorb the water vapor evaporated from the defrosting medium in the heat-absorbing channel, thereby increasing the storage capacity of the defrosting medium in the transfer container 130.

[0072] When the heat-releasing element 120 defrosts the evaporator 400, the heat dissipation element 160 continuously dissipates heat to the transfer container 130 to maintain its low temperature state, thereby increasing the desorption and vaporization rate of the defrosting medium in the transfer container 130. This allows the defrosting medium in the transfer container 130 to continuously and stably desorb water vapor and transport it to the heat-releasing element 120 side to participate in phase change heat transfer, ensuring that the defrosting process of the evaporator 400 is continuous, uniform, and efficient.

[0073] Reference Figures 1 to 5In one embodiment, the inner wall of the heat release channel is coated with a hydrophobic layer. The hydrophobic layer can inhibit the spread of a uniform liquid film, reduce the heat transfer resistance generated by the liquid film, enhance the phase change heat transfer capacity between the heat release channel and water vapor, improve the condensation liquefaction rate and latent heat release effect, and thus improve the uniformity and efficiency of the evaporator 400 targeted defrosting.

[0074] It should be noted that, in other embodiments, the inner walls of other pipes or components of the loop assembly 100 may also be coated with a hydrophobic layer.

[0075] Reference Figures 1 to 5 According to another aspect of this application, embodiments of this application also provide a control method for a defrosting system, hereinafter referred to as the control method. The control method is applied to the above-described defrosting system and includes: S101: During normal operation of the condenser 300, the first on / off control element 151 is in the on state, and the second on / off control element 152 and the third on / off control element 153 are both in the off state, so that the defrosting medium in the heat absorption channel is heated and vaporized and condensed and liquefied in the transfer container 130. S102: After the condenser 300 stops operating, both the first on / off control element 151 and the third on / off control element 153 are in the cut-off state, and the second on / off control element 152 is in the conducting state, so that the defrosting medium in the transfer container 130 spontaneously vaporizes and condenses into liquefaction in the heat release element 120. S103: After defrosting is completed, the first on / off control element 151 and the second on / off control element 152 are both in the cut-off state, and the third on / off control element 153 is in the conduction state, so that the defrosting medium in the collection container 140 flows back to the heat release element 120.

[0076] In this embodiment of the application, during normal operation of the condenser 300, the defrosting medium in the heat absorption channel is heated and vaporized to generate water vapor. The water vapor can only enter the transfer container 130, condense and liquefy and be temporarily stored in the transfer container 130. It will not flow to the heat release channel of the heat release element 120, thereby realizing the effective recovery and storage of waste heat of the condenser 300.

[0077] After the condenser 300 stops operating, the heat release channel of the heat release element 120 is in a low-temperature environment. Therefore, a saturated vapor pressure difference is formed between the inside of the heat release channel and the transfer container 130, which drives the defrosting medium in the transfer container 130 to spontaneously vaporize and generate water vapor. The water vapor is driven by the pressure difference to enter the heat release channel and undergoes a gas-liquid phase change and condensation in the heat release channel. The phase change process releases latent heat and transfers it to the evaporator 400, thereby achieving targeted heat release and uniform defrosting.

[0078] After defrosting is completed, the liquid defrosting medium collected in the collection container 140 can flow smoothly back into the heat absorption channel of the heat absorption element 110, completing the medium circuit reset and preparing the medium for the next condenser 300 waste heat recovery and defrosting cycle.

[0079] By adopting the above-mentioned time-sharing on / off control method, three working stages can be realized: heat recovery, targeted defrosting, and medium recirculation reset. On the one hand, the operating sequence of refrigeration and defrosting conditions can be staggered to reduce energy loss caused by ineffective heat exchange; on the other hand, the defrosting medium can be recycled and reused to ensure the long-term stable operation of the gas-liquid phase change circuit and improve the reliability and energy-saving effect of the defrosting system.

[0080] Reference Figures 1 to 5 In one embodiment, the defrosting medium is a hygroscopic solution, the collection container 140 is connected to the first output terminal 112, and a fourth on / off control element 154 is provided in the connecting pipe between the collection container 140 and the first output terminal 112. The fourth on / off control element 154 and the first on / off control element 151 are respectively located in different connecting pipes.

[0081] During normal operation of the condenser 300, the fourth on / off control element 154 is in the off state; after the condenser 300 stops operating, the fourth on / off control element 154 is in the on state.

[0082] During normal operation of the condenser 300, by setting the fourth on / off control element 154 to the off state, the communication channel between the heat absorption element 110 and the collection container 140 is cut off, preventing the defrosting medium in the heat absorption channel from being heated and vaporized to generate water vapor that accidentally enters the collection container 140 and condenses, thereby ensuring that the defrosting medium in the transfer container 130 has sufficient storage capacity and ensuring that subsequent defrosting operations are stable.

[0083] Since the heat absorber 110 absorbs heat from the condenser 300, the concentration of the defrosting medium in the heat absorber channel increases due to the evaporation of water. The high-concentration hygroscopic solution has strong hygroscopic properties and can significantly reduce the internal air pressure of the heat absorber channel. Therefore, after the condenser 300 stops operating, by putting the fourth on / off control element 154 into the conducting state, the communication channel between the collection container 140 and the first output terminal 112 is put into the conducting state, so that the loop assembly 100 continues to maintain a low-pressure environment, ensuring that the defrosting medium in the transfer container 130 can stably and spontaneously vaporize, and continuously provide the latent heat of phase change to the evaporator 400 to achieve targeted defrosting.

[0084] Reference Figures 1 to 5In one embodiment, the defrosting medium is a hygroscopic solution; during normal operation of the condenser 300, when the concentration of the defrosting medium in the heat absorption element 110 reaches a preset upper limit value, the first on / off control element 151, the second on / off control element 152 and the third on / off control element 153 are all in a cut-off state.

[0085] In this embodiment, during normal operation of the condenser 300, when the concentration of the defrosting medium in the heat absorption element 110 reaches a preset upper limit value, the fourth on / off control element 154 is also in a cut-off state.

[0086] In addition, the cooling fan 162 stops operating only when the channels between the heat absorption element 110 and the transfer container 130, the transfer container 130 and the heat release element 120, the heat release element 120 and the collection container 140, and the collection container 140 and the heat absorption element 110 are all cut off. It operates normally during other periods.

[0087] Using the concentration of the hygroscopic solution reaching the preset upper limit as the basis for switching operating conditions can effectively reduce the risk of crystallization and precipitation of the defrosting medium due to excessive concentration, thereby reducing the problems of moisture absorption capacity decay and phase change characteristics shift. It can always maintain the defrosting medium within a reasonable concentration range and ensure that the moisture absorption, vaporization, condensation and differential pressure self-driving characteristics of the defrosting medium are stable and reliable.

[0088] Reference Figures 1 to 5 According to another aspect of this application, an embodiment of this application also provides a refrigerator, which includes a compressor 200, a condenser 300, an evaporator 400, and the aforementioned defrosting system. The output end of the compressor 200 is connected to the input end of the condenser 300, the output end of the condenser 300 is connected to the input end of the evaporator 400, and the output end of the evaporator 400 is connected to the input end of the compressor 200. The heat-absorbing element 110 is in contact with the outer surface of the condenser 300, and the heat-releasing element 120 is in contact with the outer surface of the evaporator 400.

[0089] In this embodiment, the start / stop state of the compressor 200 determines the operating conditions of the condenser 300 and the evaporator 400. Specifically, when the compressor 200 is running normally, it drives the refrigerant to circulate, the condenser 300 continuously releases heat, and the evaporator 400 continuously absorbs heat to cool down, causing water vapor in the air to gradually condense and frost on the surface of the evaporator 400. After the compressor 200 stops running, the refrigerant circulation terminates, the condenser 300 stops releasing heat, and the evaporator 400 also stops cooling, and the entire unit then enters a defrosting state. Furthermore, a throttling valve 500 is provided in the communication channel between the condenser 300 and the evaporator 400.

[0090] It should be noted that in other embodiments, the heat-absorbing component 110 can also absorb the waste heat generated by the condenser 300 by wrapping, circling the heat exchanger, or attaching the heat exchanger plate, and the heat-releasing component 120 can release heat for the evaporator 400 by air duct guidance, heat exchange fin conduction, or attaching the heat exchanger plate.

[0091] On the one hand, the heat-absorbing component 110 is directly attached to the outer surface of the condenser 300, which can efficiently collect the waste heat emitted during the operation of the condenser 300, recover the originally lost waste heat and use it to drive the gas-liquid phase change cycle of the defrosting system. There is no need to configure energy-consuming devices such as electric heating for the defrosting system, which reduces the energy consumption of the refrigerator defrosting and improves the overall energy efficiency level.

[0092] On the other hand, the heat release element 120 is directly attached to the outer surface of the evaporator 400, which can directly release latent heat to defrost the evaporator 400. The heat conduction path is short and the heat exchange loss is small. The defrosting heat can be accurately applied to the frosted area of ​​the evaporator 400, making defrosting more uniform and faster.

[0093] On the other hand, the defrosting system relies on the residual heat of the condenser 300 and the low-temperature environment of the evaporator 400 to autonomously complete the gas-liquid phase change cycle and pressure difference-driven defrosting. It does not intervene in the refrigerant circulation path between the compressor 200, condenser 300 and evaporator 400, and does not require modification to the original refrigeration circuit structure and control logic of the refrigerator. While achieving passive autonomous defrosting, it can ensure that the normal refrigeration operation of the refrigerator is not disturbed, so that the refrigeration operation and defrosting work do not interfere with each other, are coordinated in sequence and operate stably.

[0094] Reference Figures 1 to 5 In one embodiment, the heat-absorbing element 110 is coiled around the outer periphery of the condenser 300 and is in contact with the condenser 300.

[0095] In this embodiment, the heat-absorbing element 110 is a heat-absorbing coil. The heat-absorbing element 110 can be arranged on the outer periphery of the condenser 300 by spiral winding, multi-layer winding, circumferential winding, or other winding methods.

[0096] The heat absorber 110 is coiled around the outer periphery of the condenser 300 and kept in close contact, which can increase the effective heat exchange contact area between the heat absorber 110 and the condenser 300, fully capture the waste heat dissipated by the condenser 300 during operation, and effectively improve the efficiency of heat collection and heat transfer.

[0097] Meanwhile, the heat-absorbing component 110 is arranged around the outer periphery of the condenser 300. The overall structure fits the shape of the condenser 300, occupies little space, and does not require additional independent installation positions. This facilitates the orderly arrangement of internal pipes and components of the refrigerator. The overall structure is compact and highly integrated, which is conducive to the miniaturization design of the refrigerator.

[0098] Reference Figures 1 to 5In one embodiment, the heat-releasing element 120 is coiled around the outer periphery of the evaporator 400 and is in contact with the evaporator 400.

[0099] In this embodiment, the heat-releasing element 120 is a heat-releasing coil. The heat-releasing element 120 can be arranged on the outer periphery of the evaporator 400 by spiral winding, multi-layer winding, circumferential winding, or other winding methods.

[0100] The heat release element 120 is coiled around the outer periphery of the evaporator 400 and kept in close contact, which can increase the effective heat exchange contact area between the heat release element 120 and the evaporator 400, help to release heat synchronously on the entire frost layer on the outer surface of the evaporator 400, reduce local heat exchange blind spots, widen the defrosting coverage area, and improve the uniformity and thoroughness of melting.

[0101] Meanwhile, the heat release element 120 is arranged around the outer periphery of the evaporator 400. The overall structure fits the shape of the evaporator 400, occupies little space, and does not require additional independent installation positions. This facilitates the orderly arrangement of internal pipes and components of the refrigerator. The whole machine has a compact structure and high integration, which is conducive to the miniaturization design of the refrigerator.

[0102] In summary, implementing the defrosting system and control method and the refrigerator provided in this embodiment has at least the following beneficial technical effects: The defrosting system of this application relies on the latent heat released by the gas-liquid phase change to induce the melting of the frost layer on the evaporator 400, which has multiple advantages over traditional electric heating defrosting: Firstly, during the operation of the defrosting system, the heat-absorbing element 110 absorbs the waste heat generated during the operation of the condenser 300, causing the defrosting medium in the heat-absorbing channel to undergo a liquid-gas phase change. During the phase change, the waste heat from the condenser 300 is absorbed and stored as latent heat. Subsequently, the defrosting medium in the transfer container 130 spontaneously vaporizes, and cleverly utilizes temperature difference and gravity as driving forces to complete the gas-liquid phase change condensation and liquefaction in the heat-releasing element 120, simultaneously releasing the latent heat of phase change to the evaporator 400 to achieve defrosting. This application achieves defrosting by recovering the waste heat generated by the condenser 300 itself. Compared with the active defrosting method using high-power electric heating tubes, it does not require additional electrical energy consumption for defrosting, achieving low-energy passive defrosting and helping to reduce operating costs.

[0103] Secondly, the gas-liquid phase change process has the physical characteristics of gentle heat release and relatively constant operating temperature. The defrosting medium always completes the vaporization and liquefaction cycle at a relatively mild phase change temperature in the loop component 100, without generating local extreme high temperatures. Compared with the defrosting method using high-power electric heating tubes, the mild phase change defrosting mechanism adopted in this application can effectively avoid the thermal shock to the evaporator 400 caused by the high-temperature heat radiation and heat convection of traditional electric heating defrosting, weaken the heat penetration effect caused by the defrosting cycle, suppress the drastic temperature fluctuation of the evaporator 400, achieve mild defrosting, and ensure the stability of the freshness preservation environment of the compartment corresponding to the evaporator 400.

[0104] Third, after the defrosting medium vaporizes, it flows in the heat release channel of the heat release element 120 in the form of steam. Relying on the structural design of the heat release element 120 being in close contact with the evaporator 400, and combined with the thermodynamic temperature difference tendency of the steam flow, the steam can automatically gather in the area with lower temperature and thicker frost layer on the outside of the heat release channel wall, and release more latent heat of phase change for defrosting. This inherent targeted tracking and adaptive adjustment capability of the steam-liquid phase change allows the defrosting heat to automatically match the frost thickness in different areas of the evaporator 400, fundamentally overcoming the technical limitations of traditional high-power electric heating tubes that have a fixed defrosting heat distribution and cannot adapt to the non-uniform frost on the surface of the evaporator 400, thus improving the thoroughness and consistency of defrosting.

[0105] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A defrosting system for condensing heat recovery of a refrigerator, characterized in that, It includes a defrosting medium and a circuit assembly, wherein the defrosting medium includes at least one of water and a hygroscopic solution, and the defrosting medium circulates within the circuit assembly; The loop assembly includes a heat-absorbing element, a heat-releasing element, a transfer container, and a collection container. The heat-absorbing element has a heat-absorbing channel filled with the defrosting medium, and a first input end and a first output end communicating with the heat-absorbing channel. The heat-releasing element has a heat-releasing channel, and a second input end and a second output end communicating with the heat-releasing channel. The transfer container is filled with the defrosting medium and is connected to the first output end and the second input end. The collection container is connected to the second output end and the first input end. The heat-absorbing element is used to absorb heat from the refrigerator's condenser, so that the defrosting medium in the heat-absorbing channel is heated and vaporized; the transfer container is used to receive and condense the defrosting medium. The heat-releasing element is used to release heat to defrost the evaporator of the refrigerator, and can make the gas pressure in the heat-releasing channel lower than the saturated vapor pressure of the defrosting medium in the transfer container, so as to drive the defrosting medium in the transfer container to spontaneously vaporize and condense and liquefy in the heat-releasing element; the collection container is used to receive the liquid defrosting medium flowing out from the second output end, and can deliver the liquid defrosting medium to the first input end.

2. The defrosting system for condensing heat recovery of a refrigerator according to claim 1, characterized in that, The connecting pipe between the first output terminal and the transfer container is provided with a first on / off control element, the connecting pipe between the transfer container and the second input terminal is provided with a second on / off control element, the connecting pipe between the second output terminal and the collection container remains open, and the connecting pipe between the collection container and the first input terminal is provided with a third on / off control element.

3. The defrosting system for condensing heat recovery of a refrigerator according to claim 2, characterized in that, The collection container is connected to the first output terminal.

4. The defrosting system for condensing heat recovery of a refrigerator according to claim 3, characterized in that, The connecting pipe between the collection container and the first output terminal is provided with a fourth on / off control component, which is located in a different connecting pipe from the first on / off control component.

5. The defrosting system for refrigerator condensation heat recovery according to claim 1, characterized in that, The collection container is positioned above the heat-absorbing element; and / or, The heat-releasing element is disposed above the collection container; and / or, The transfer container is externally equipped with a heat dissipation component, which is used to dissipate heat from the transfer container; and / or, The inner wall of the heat release channel is coated with a hydrophobic layer.

6. A control method for a defrosting system for refrigerator condensation heat recovery, applied to the defrosting system for refrigerator condensation heat recovery as described in any one of claims 2 to 4, characterized in that, The control method includes: During normal operation of the refrigerator's condenser, the first on / off control element is in the conducting state, while the second and third on / off control elements are both in the cut-off state, so that the defrosting medium in the heat absorption channel is heated and vaporized and condensed and liquefied in the transfer container. After the condenser stops operating, both the first on / off control element and the third on / off control element are in the cut-off state, and the second on / off control element is in the conducting state, so that the defrosting medium in the transfer container spontaneously vaporizes and condenses into liquefaction in the heat release element. After defrosting is completed, both the first and second on / off control elements are in the cut-off state, and the third on / off control element is in the conducting state, so that the defrosting medium in the collection container flows back to the heat release element.

7. The control method for a defrosting system for refrigerator condensation heat recovery according to claim 6, characterized in that, The defrosting medium is a hygroscopic solution. The collection container is connected to the first output end. A fourth on / off control component is provided in the connecting pipe between the collection container and the first output end. The fourth on / off control component and the first on / off control component are located in different connecting pipes. During normal operation of the condenser, the fourth on / off control element is kept in the off state; After the condenser stops operating, the fourth on / off control element is put into the on state.

8. The control method for a defrosting system for refrigerator condensation heat recovery according to claim 6, characterized in that, The defrosting medium is a hygroscopic solution; during normal operation of the condenser, when the concentration of the defrosting medium in the heat absorption element reaches a preset upper limit, the first on / off control element, the second on / off control element, and the third on / off control element are all in a cut-off state.

9. A refrigerator, characterized in that, The system includes a compressor, a condenser, an evaporator, and a defrosting system for condensation heat recovery in a refrigerator as described in any one of claims 1 to 5. The output end of the compressor is connected to the input end of the condenser, the output end of the condenser is connected to the input end of the evaporator, and the output end of the evaporator is connected to the input end of the compressor. The heat-absorbing element is in contact with the outer surface of the condenser, and the heat-releasing element is in contact with the outer surface of the evaporator.

10. The refrigerator according to claim 9, characterized in that, The heat-absorbing element is coiled around the outer periphery of the condenser and is in close contact with the condenser; and / or, The heat-releasing element is coiled around the outer periphery of the evaporator and is in close contact with the evaporator.

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